I have both a cat and a dog. My cat has had an episode of constipation before but my dog is constipated now.
My dog acts like he wants to 'go' but nothing comes out.

My question is this, Is there a rule of thumb for constipation in dogs? why do they get constipated and can you treat it with imodium or another laxative? When should i be so worried that I should take it to the vet.

My other question is exactly the same but for cats, Is there a rule of thumb for constipation in cats? why do they get constipated and can you treat it with imodium or another laxative? When should I be so worried that I should take it to the vet.